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Did you manage to install 10.12.5 and get the GTX 650 working. Mine refuses to work. I'm using G41 chipset with a E8400 lga775. My SMBIOS is MacPro6,1 and I'm using PikerAlphas AppleGraphicsDevicePolicy.kext patch to make MacPro6,1 compatible (this worked on 10.12.4).

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Unfortunately I switched over to an MSI GTX 980 4G card. Running 10.12.5 no problems. 775 is quite old but glad to see you've gotten as far as you have. 


Define what exactly "refuses to work" means. Where is it hanging in boot? 

I recommend installing the latest web drivers from Nvidia. To do that, since your locked out of your OS, you'll probably have to do some digging around on the forums to see how to do that. It's probably just a matter of copying over Nvidia kexts. Also, look to see what changes were made to 10.12.5 update in regard to graphics. 


My last recommendation would be to post on insanelymac forum and see what they think. 



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